Front brake driving me mad

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Front brake driving me mad

Post by Hagafan » Sat Jun 08, 2013 8:12 am

I have a recurring fault with my front brake and it is doing my head in. This fault has happened half a dozen times over the last year.After using front brake for any period of time the lever goes solid and the brake sticks on. if I release the pressure by opening bleed nipple it is ok but then does it again.??????????? I have changed master cylinder internals, caliper seals, pads and am wishingI could junk the calipers for something else. Any thoughts? :cry:

1985 Honda Spacy/Elite
1984 Honda GL1200 DL

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Re: Front brake driving me mad

Post by trike lady » Sat Jun 08, 2013 5:03 pm

Sometimes the brake fluid return gets clogged. There's two orifices and the smaller one clogs.
A salvage yard may have a replacement front master cylinder.
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Re: Front brake driving me mad

Post by plumbermullins » Sun Jun 09, 2013 10:30 pm

a very small wire or a torch tip cleaner will clean out that small hole and let the caliper release.
Never collapse a caliper back to the master cylinder thats the #1 cause for this port getting clogged open the bleeder to collapse a caliper. good luck

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Re: Front brake driving me mad

Post by Blue1Oldie » Fri Jun 21, 2013 12:06 pm

If you have or PO changed the clutch/brake levers they may be causing your issues. A few of the aftermarket levers do not "fit" properly and cause the levers to keep pressure to the brake line. I's suggest you check the levers and replace with "stock" items.


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Re: Front brake driving me mad

Post by virgilmobile » Fri Jun 21, 2013 1:19 pm

Same here on the plugged pressure relief hole.
Side note:if you run the small wire through it to clean it out,you also push that Stuff into the master cylinder just to be pushed right back into the hole and plug it up again.
If you clean out the hole,flush the master clean and refill with new fluid.

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Re: Front brake driving me mad

Post by thrasherg » Fri Jun 21, 2013 1:26 pm

This issue can only be due to a problem with the master cylinder end.. So leave the slave cylinder alone. As stated you either have dirt in the tiny return hole (but as you changed the master cylinder, it would be really unlucky to have 2 master cylinders and both blocked!!) or as stated you front brake lever is not working correctly. If the lever does not let the piston in the master cylinder fully return, it will cause the hydraulic system to lock up as you describe. I would be checking you brake lever (Is it a genuine Honda part or an after market part?). I would be looking to grind a small amount of the lever (where it contacts the master cylinder piston) and see if that improves the situation.


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